Examine source code of To Remember

{
  "manifest_version": 2,
  "name": "To Remember",
  "version": "1.1",
  "description": "Set reminder in your browser",
  "browser_specific_settings": {
    "gecko": {
      "id": "98c1b24720a899dbabc2a56e31b9020e@zareie.net"
    }
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "notifications",
    "alarms",
    "storage",
    "activeTab"
  ],
  "sidebar_action": {
    "default_title": "To Remember",
    "default_panel": "html/sidebar.html",
    "default_icon": {
      "16": "icons/reminder.png",
      "32": "icons/reminder.png"
    }
  },
  "background": {
    "page": "html/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/reminder.png",
    "48": "icons/reminder.png",
    "128": "icons/reminder.png"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Y",
        "mac": "Command+Y"
      },
      "description": "Open the sidebar"
    },
    "show_notification": {
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "Command+Shift+L"
      },
      "description": "Show a notification"
    }
  }
}